In reply to Indesign ALL CAPS button: what OT-Features does it apply? What is "desired behavior"?:
Hrant, one of the things that makes laying out a book challenging is that one is generally forced to work with tools that one did not make oneself, and which may be limited in various regards. A complex text is indeed a challenging thing to work with, without the relative freedom of creating one's own typeface to fit. I spent much of the past four years working on the Brill fonts, but I never forgot that my challenges derived from the challenges that Brill's typesetters had struggled with for 325 years of scholarly publishing.
Whether this means that 'nothing is as challenging as laying out a book', I'm not so sure. My wife is a firefighter.